Concrete Tilt-up / post tensioning

I work with [ ] Tensioning, which is based in the [ ] area. We are a company that supplies and installs PT [ post tensioning] in mainly commercial building and bridge construction. We are looking for some engineering information on PT slab on grade and PT tilt-up wall panels. Any leads you could pass on would be greatly appreciated.
The first source I would check is the ACI (American Concrete Institute) publications on PT concrete.

American Concrete Institute
PO Box 19150
Redford Station
Detroit, Michigan 48219

313-532-2600

Another good source that publishes guides is:

Precast/Prestressed Concrete Institute
175 W. Jackson Blvd.
Chicago, Illinois 60604

312-786-0300

For Tilt-ups check:

Tilt-Up Concrete Association
P.O. Box 204
107 First Street West
Mount Vernon, Iowa 52314

(319) 895 - 6911
esauter@tilt-up.org

All these organizations also have Web sites. You can find links in my Home Page

A good place to start would be at the engineering library at the nearest university.